Stabilizer compositions for PVC resins

ABSTRACT

Compositions which are effective in stabilizing polymers against the deteriorative effects of heat are provided comprising (1) a mono-organotin compound or mixture of mono-organotin compounds, (2) a mercaptan-containing organic compound or mixture of mercaptan-containing organic compounds, and, optionally (3) a diorganotin compound or mixture of diorganotin compounds. Also provided are polymer compositions containing said stabilizers and articles of manufacture made from said stabilized polymer compositions.

This application is a continuation of application Ser. No. 382,822, filed May 27, 1982 now abandoned which is in turn a continuation of application Ser. No. 238,298 filed Feb. 26, 1981 now abandoned.

FIELD OF THE INVENTION

This invention relates to stabilizer compositions containing (1) a mono-organotin compound or mixture of mono-organotin compounds, (2) a mercaptan-containing organic compound or mixture of mercaptan-containing organic compounds, and, optionally (3) a diorganotin compound or mixture of diorganotin compounds. This invention also relates to polymer compositions containing (1) a polymer normally susceptible to heat induced deterioration, (2) a mono-organotin compound or mixture of mono-organotin compounds, (3) a mercaptan-containing organic compound or mixture of mercaptan-containing organic compounds, and, optionally, (4) a diorganotin compound or mixture of diorganotin compounds. This invention further relates to articles of manufacture, e.g. pipe, made from stabilized polymer compositions comprising (1) a polymer normally susceptible to heat induced deterioration, (2) a mono-organotin compound or mixture of mono-organotin compounds, (3) a mercaptan-containing organic compound or mixture of mercaptan containing organic compounds, and, optionally, (4) a diorganotin compound or mixture of diorganotin compounds.

BACKGROUND OF THE INVENTION

Organotin compounds, particularly useful as stabilizers for halogen containing polymers, are well-known in the art. These organotin compounds can provide stabilization of such polymers when used alone or in combination with various compounds. For example, U.S. Pat. No. 3,503,924 to M. W. Pollock discloses stabilizers for polyvinyl chloride resins which are mixtures containing a diorganotin mercaptide and a minor amount of an alpha-mercapto acid. Pollock also discloses, in U.S. Pat. No. 3,507,827, stabilizer combinations for decreasing early discoloration of polyvinyl chloride resins which contain (1) a dialkyl, dicycloalkyl or alkylcycloalkyl tin mercapto carboxylic acid ester, and (2) an alpha- or beta-mercapto acid having at least three carbon atoms, or an alpha- or beta-mercapto alcohol having at least two carbon atoms.

SUMMARY OF THE INVENTION

In accordance with this invention there are provided compositions for stabilizing halogen-containing organic polymers which comprise (1) a mono-organotin compound or mixture of mono-organotin compounds, (2) a mercaptan-containing organic compound or mixture of mercaptan-containing organic compounds, and, optionally, (3) a diorganotin compound or mixture of diorganotin compounds. This invention is also directed to polymer compositions comprising (1) a polymer normally susceptible to heat induced deterioration, (2) a mono-organotin compound or mixture of mono-organotin compounds, (3) a mercaptan-containing organic compound or mixture of mercaptan-containing organic compounds, and, optionally, (4) a diorganotin compound or mixture of diorganotin compounds. Additionally, this invention is directed to articles of manufacture, e.g. pipe, made from stabilized polymer compositions comprising (1) a polymer normally susceptible to heat induced deterioration, (2) a mono-organotin commpound or mixture of mono-organotin compounds, (3) a mercaptan-containing organic compound or mixture of mercaptan-containing organic compounds, and, optionally, (4) a diorganotin compound or mixture of diorganotin compounds.

DETAILED DESCRIPTION

The stabilizer compositions of this invention have quite unexpectedly been found to impart stabilization against the deteriorative effects of heat to halogen-containing organic polymers which is superior to those stabilizer compositions previously known in the art.

The term halogen-containing organic polymers as used herein refers to halogen-containing vinyl and vinylidene polymers or resins in which the halogen is attached directly to the carbon atoms. Preferably, the polymer is a vinyl halide polymer, more particularly a vinyl chloride polymer. Usually, the vinyl chloride polymer is made from monomers consisting of vinyl chloride alone or a mixture of monomers comprising, preferably, at least about 70% by weight based on the total monomer weight of vinyl chloride.

The halogen-containing polymers which can be stabilized according to this invention include chlorinated polyethylene having 14 to 75%, e.g. 27%, chloride by weight, chlorinated natural and synthetic rubber, rubber hydrochloride, chlorinated polystyrene, chlorinated polyvinyl chloride, polyvinyl bromide, polyvinyl fluoride, copolymers of vinyl chloride with 1 to 90%, preferably 1 to 30%, of a copolymerizable ethylenically unsaturated material such as, for example, vinyl acetate, vinyl butyrate, vinyl benzoate, vinylidene chloride, diethyl fumarate, diethyl maleate, other alkyl fumarates and maleates, vinyl propionate, methyl acrylate, 2-ethylhexyl acrylate, butyl acrylate and other alkyl acrylates, methyl methacrylate, ethyl methacrylate, butyl methacrylate and other alkyl methacrylates, methyl alpha-chloroacrylate, styrene, trichloroethylene, vinyl ethers such as vinyl ethyl ether, vinyl chloroethyl ether and vinyl phenyl ether, vinyl ketones such as vinyl methyl ketone and vinyl phenyl ketone, 1-fluoro-2-chloroethylene, acrylonitrile, chloroacrylonitrile, allylidene diacetate and chloroallylidene diacetate. Typical copolymers include vinyl chloride-vinyl acetate (96:4 sold commercially as VYNW), vinyl chloride-vinyl acetate (87:13), vinyl chloride-vinyl acetate-maleic anhydride (86:13:1), vinyl chloride-vinylidene chloride (95:5); vinyl chloride-diethyl fumarate (95:5), and vinyl chloride-2-ethylhexyl acrylate (80:20). In addition to the stabilizer compositions of this invention, there can also be incorporated into the halogen-containing organic polymer conventional additives such as plasticizers, pigments, fillers, dyes, ultraviolet light absorbing agents, densifying agents and the like.

The stabilizer compositions useful in the practice of this invention comprise (1) a mono-organotin compound or mixture of mono-organotin compounds, (2) a mercaptan-containing organic compound or mixture of mercaptan-containing organic compounds, and, optionally, (3) a diorganotin compound or mixture of diorganic compounds. The mono-organotin compounds useful in this invention contain one or more tetravalent tin atoms which each have one direct tin to carbon bond and have structures selected from the following formulas: ##STR1## wherein X and X' are the same or different and are selected from --SR², ##STR2## and O--R⁸ with the proviso that in formula (V) when z=1 and in formulas (III) and (IV) at least one X or X¹ is --SR² ;

Y is ##STR3## W and W¹ are the same or different and are oxygen or sulfur; R and R¹ are the same or different and are selected from alkyl, aryl, alkenyl, aralkyl, alkaryl, cycloalkyl, cycloalkenyl, ##STR4## R² is alkyl, alkenyl, aryl, aralkyl, cycloalkyl, cycloalkenyl, ##STR5## R³ is alkylene of at least 2 carbon atoms, arylene, alkenylene of at least 2 carbon atoms, cycloalkylene, or cycloalkenylene;

R⁴ is alkylene, arylene, alkenylene of at least 2 carbon atoms, cycloalkylene, or cycloalkenylene;

R⁵ is R³ ;

R⁶ is nothing or R⁴ ;

R⁷ is --H or R⁸ ;

R⁸ is alkyl, alkenyl, aryl, aralkyl, alkaryl, cycloalkyl, or cycloalkenyl;

R⁹ is C₁ to C₄ alkylene;

R¹² is --H or a monovalent C₁ to C₂₀ hydrocarbon radical;

R¹³ and R²¹ are the same or different and are each C₁ to C₂₀ alkyl or C₁ to C₂₀ alkoxy;

q=0 or an integer from 1 to 4 inclusive;

v=an integer from 1 to 8 inclusive; and

w=0, 1 or 2, x=0 or 1, z=0 or 1 with the proviso that when x=0 than z=1, when x=1 then z=0 and w=1, when w=2 then x=0 and z=1, and when w=0 then x=0, z=1 and Y is --W--R³ --W¹ -- or ##STR6##

As used herein the term alkyl represents monovalent straight or branched chain hydrocarbon radicals containing, for example, 1 to 20 carbon atoms. The term aryl refers to monovalent C₆ -C₁₀ aromatic rings such as benzene and naphthalene. The term alkenyl refers to monovalent straight or branched chain C₂ to C₂₀ hydrocarbon radicals containing at least one double bond. The term aralkyl represents a monovalent C₁ to C₂₀ hydrocarbon radical having attached thereto an aryl radical. The term alkaryl refers to monovalent aryl radicals having attached thereto at least one C₁ -C₂₀ alkyl group. The term cycloalkyl represents monovalent C₃ -C₈ saturated cycloaliphatic radicals, and the term cycloalkenyl represents C₅ -C₈ cycloaliphatic radicals containing at least one double bond.

The preferred mono-organotin compounds useful in this invention are those compounds according to formula (I) where R is methyl, butyl or octyl and W is sulfur; those compounds according to formula (II) where R¹ is methyl or butyl, W is sulfur, X is --SR² where R² is ##STR7## those compounds according to formula (III) where R is methyl or butyl, X is --SR² where R² is ##STR8## those compounds according to formula (IV) where R is methyl, X is --SR² where R² is ##STR9## R¹ is methyl, X¹ is --SR² where R² is ##STR10## Y is --S--, and q=0; and those compounds according to formula (V) where R is methyl, X is --SR² where R² is ##STR11## R¹ is methyl, X¹ is --SR² where R² is ##STR12## Y is --S--, W=1, x=0, and z=1.

Examples of mono-organotin compounds which are useful in this invention include, but are not limited to, those illustrated in Tables I-IV below. Thus, representative of the mono-organotin compounds described by formulas (I) and (II) are those illustrated in Table I below.

Examples of the mono-organotin compounds represented by formula (III) are illustrated in Table II below.

The mono-organotin compounds illustrated in Table III below are representative of compounds described in formula (IV).

The mono-organotin compound illustrated in Table IV below is representative of compounds described by formula (V).

                                      TABLE I                                      __________________________________________________________________________      ##STR13##                                                                     Mono-organotin                                                                 Compound No.                                                                           R    R.sup.1   W X                                                     __________________________________________________________________________     1       C.sub.4 H.sub.9                                                                     --        S --                                                    2       C.sub.8 H.sub.17                                                                    --        O --                                                    3       --   CH.sub.3  S                                                                                 ##STR14##                                            4       --   CH.sub.3  S                                                                                 ##STR15##                                            5       --                                                                                   ##STR16##                                                                               S                                                                                 ##STR17##                                            __________________________________________________________________________

                  TABLE II                                                         ______________________________________                                         RSnX.sub.3                    (III)                                            Mono-organotin                                                                 Compound No. R        X                                                        ______________________________________                                         6            CH.sub.3                                                                                 ##STR18##                                               7            C.sub.4 H.sub.9                                                                          ##STR19##                                               ______________________________________                                    

                                      TABLE III                                    __________________________________________________________________________      ##STR20##                                         (IV)                        Mono-organotin                                                                 Compound No.                                                                           R and R.sup.1                                                                            X               X.sup.1                                                                            Y             q                          __________________________________________________________________________     8       CH.sub.3                                                                                  ##STR21##      Same as X                                                                          S             0                                   ##STR22##                                                                                ##STR23##      Same as X                                                                          SS            0                          10      CH.sub.3                                                                                  ##STR24##      Same as X                                                                           ##STR25##    1                          11      CH.sub.3                                                                                  ##STR26##      Same as X                                                                          S             0                          12      C.sub.4 H.sub.9                                                                           ##STR27##      Same as X                                                                           ##STR28##    0                          13      CH.sub.3                                                                                  ##STR29##      Same as X                                                                          S             0                          14      C.sub.4 H.sub.9                                                                           ##STR30##      Same as X                                                                           ##STR31##    0                          __________________________________________________________________________

                  TABLE IV                                                         ______________________________________                                          ##STR32##                    (V)                                              Mono-                                                                          organotin                                                                      Compound                                                                       No.     R and R.sup.1                                                                           X and X.sup.1   Y     w x z                                   ______________________________________                                         15      CH.sub.3                                                                                 ##STR33##      S     10 1                                    ______________________________________                                    

As used in Tables I-III above, and throughout this specification, the radicals --C₄ H₉, --C₈ H₁₇, --C₁₂ H₂₅, --C₉ H₁₉ and --C₁₀ H₂₁ represent n-butyl, n-octyl, n-dodecyl, n-nonyl and n-decyl respectively.

The carboxyl radicals ##STR34## are derived from oleic acid, stearic acid, n-octanoic acid, lauric acid, and pelargonic acid respectively. Likewise, the radicals --OC₁₃ H₂₇, --OC₁₈ H₃₇, and --OC₈ H₁₇ are derived from tridecanol, stearyl alcohol and iso-octanol respectively.

The mercaptan-containing organic compounds useful in this invention include hydrocarbyl mercaptans, mercapto esters, mercapto alcohols, and mercapto acids. These mercaptan-containing organic compounds have structures illustrated by the following formulas: ##STR35## R¹⁰ is cycloalkyl, cycloalkenyl or phenyl; R¹⁴ is --H, aryl, or C₁ to C₁₈ alkyl;

R¹⁵ and R²⁴ are the same or different and are ##STR36## --OH, --SH, aryl, C₁ to C₁₈ alkyl, or --H; R¹⁶ is --H, or R⁸ ;

R¹⁷ is ##STR37## R¹⁸ is arylene, C₁ to C₈ alkylene, or ##STR38## R¹⁹ is --H or a divalent group which may contain halogen, hydroxy, mercapto or alkyl substituents and which when R¹⁰ is phenyl combines with the phenyl to form a naphthalene ring;

R²⁰ is --CH₃, --CH₂ CH₃, or ##STR39## R²³ is ##STR40## --SH, aryl, C₁ to C₁₈ alkyl, --OH or --H with the proviso that in formula (VII) when R¹⁰ is phenyl, R²³ is --OH and i=0, then the --OH and --SH groups are on non-adjacent carbon atoms;

i=0 or in integer from 1 to 6 inclusive;

j=0, 1, 2 or 3; and

f=1 or 2.

The mercaptan-containing organic compounds useful in this invention are well-known compounds (see, for example, U.S. Pat. Nos. 3,503,924 and 3,507,827).

The preferred mercaptan-containing organic compounds useful in this invention are those compounds according to formula (VI) where R¹⁴ is --H, R²⁴ is --H, R¹⁵ is ##STR41## and i=1; those compounds according to formula (VII) where R¹⁰ is phenyl, R¹⁴ is --H, R²³ is --H, R¹⁹ is --H, i=1 and j=1; those compounds according to formula (VIII) where R¹⁴ is --H, R¹⁷ is ##STR42## and i=1; those compounds according to formula (IX) where R¹⁴ is --H and i=1; those compounds according to formula (X) where R²⁰ is --C₂ H₅ or ##STR43## R¹⁴ is --H and i=1; and those compounds according to formula (XI) where R¹⁴ is --H and i=1.

Examples of the mercaptan-containing organic compounds described by formula (VI) include, but are not limited to, the following compounds: ##STR44##

Examples of the mercaptan-containing organic compounds described by formula (VII) include, but are not limited to, the following compounds: ##STR45##

Examples of mercaptan-containing organic compounds represented by formula (VIII) include, but are not limited to, the following compounds: ##STR46##

An example of the mercaptan-containing organic compounds described by formula (IX) includes, but is not limited to, the following: ##STR47##

The mercaptan-containing organic compounds represented by formula (X) are exemplified by, but are not limited to, the following: ##STR48##

The mercaptan-containing organic compounds represented by formula (XI) are exemplified by, but are not limited to, the following: ##STR49##

The diorganotin compounds useful in the practice of this invention contain one or more tetravalent tin atoms, at least one of which has direct bonds to two carbon atoms and have structures selected from the following formulas: ##STR50## wherein R, R¹, W, X, X¹, Y, w and z are as previously defined;

n=0, 1 or 2, p=0, 1 or 2 with proviso that n+p=2, and m=1 to 5;

y=1 or 2, y=2 with the proviso that when w=0 then Y is --W--R³ --W¹ --, or ##STR51## and in formula (XV) when z=1 and in formulas (XIII) and (XIV) at least one X or X¹ is --SR².

The mono-organotin compounds and diorganotin compounds useful in this invention may be prepared by methods well-known in the art. See, for example, U.S. Pat. Nos. 3,565,930, 3,869,487, 3,979,359, 4,118,371, 4,134,878 and 4,183,846.

The preferred diorganotin compounds used in the practice of this invention are those compounds according to formula (XII) where R is methyl or butyl, R¹ is methyl or butyl and W is sulfur; those compounds according to formula (XIII) where R is methyl or butyl, R¹ is methyl or butyl, X is --SR² where R² is ##STR52## and X¹ is --SR² where R² is ##STR53## those compounds according to formula (XIV) where R is methyl or butyl, R¹ is methyl or butyl, Y is --S--, X is --SR² where R² is ##STR54## X¹ is --SR² where R² is ##STR55## m=1, n=2 and p=0; and those compounds according to formula (XV) where R is methyl or butyl, R¹ is methyl or butyl, X is --SR² where R² is ##STR56## Y is --S--, w=1, y=1 and z=1.

Examples of diorganotin compounds according to formula (XII) include, but are not limited to, the compounds illustrated in Table V below.

                  TABLE V                                                          ______________________________________                                          ##STR57##                   (XII)                                             Diorganotin                                                                    Compound      R          R.sup.1  W                                            ______________________________________                                         A             C.sub.4 H.sub.9                                                                           C.sub.4 H.sub.9                                                                         S                                            B             C.sub.8 H.sub.17                                                                          C.sub.8 H.sub.17                                                                        O                                            ______________________________________                                    

Examples of diorganotin compounds according to formula (XIII) include, but are not limited to, the compounds in Table VI below.

                  TABLE VI                                                         ______________________________________                                          ##STR58##                   (XIII)                                            Diorgano-                                                                      tin Com-                                                                       pound  R             R.sup.1 X and X.sup.1                                     ______________________________________                                                 ##STR59##    Same as R                                                                               ##STR60##                                        D      CH.sub.3      Same as R                                                                               ##STR61##                                        ______________________________________                                    

Examples of diorganotin compounds according to formula (XIV) include, but are not limited to, the compounds in Table VII below.

                                      TABLE VII                                    __________________________________________________________________________      ##STR62##                         (XIV)                                       Diorganotin                                                                    Compound                                                                               R and R.sup.1                                                                       X           X.sup.1                                                                            Y   n p m                                         __________________________________________________________________________     E       CH.sub.3                                                                             ##STR63##  Same as X                                                                          S   1 1 1                                         F       C.sub.4 H.sub.9                                                                      ##STR64##  Same as X                                                                          S   1 1 1                                         __________________________________________________________________________

Examples of diorganotin compounds according to formula (XV) include, but are not limited to, the compounds in Table VIII below.

                                      TABLE VIII                                   __________________________________________________________________________      ##STR65##                           (XV)                                      Diorganotin                                                                    Compound                                                                               R    R.sup.1                                                                             X           Y   w y z                                        __________________________________________________________________________     G       C.sub.4 H.sub.9                                                                     C.sub.4 H.sub.9                                                                      ##STR66##  S   1 1 1                                        __________________________________________________________________________

The stabilizer compositions of this invention may be prepared by blending the components thereof in any convenient manner which produces a homogeneous mixture, such as by shaking or stirring in a container. Likewise, the stabilized compositions of this invention can be incorporated into the halogen-containing organic polymer by admixing the stabilizer composition and polymer, such as, for example, in an appropriate mill or mixer or by any other of the well-known methods which provide uniform distribution of the stabilizer throughout the polymer.

As previously stated, the stabilizer compositions of the present invention comprise (1) a mono-organotin compound or mixture of mono-organotin compounds, (2) a mercaptan-containing organic compound or mixture of mercaptan-containing compounds, and, optionally, (3) a diorganotin compound or mixture of diorganotin compounds. More particularly, the stabilizer compositions of this invention comprise from about 10% to about 60% by weight, preferably about 20% to about 40% by weight mercaptan-containing organic compound or mixture of mercaptan-containing organic compounds, based on the total weight of the stabilizer composition, the balance of the stabilizer composition comprising a mono-organotin compound or mixture of mono-organotin compounds, and, optionally, a diorganotin compound or mixture of diorganotin compounds. Thus, when no diorganotin compound or mixture of diorganotin compounds is employed in the practice of this invention, the mono-organotin compound or mixture of mono-organotin compounds will comprise from about 40% to about 90% by weight, preferably about 60% to about 80% by weight of the total weight of the stabilizer composition. When it is desirable to utilize a diorganotin compound or mixture of diorganotin compounds in the practice of this invention, said diorganotin compound or mixture of diorganotin compounds may comprise from about 0.05% to about 75%, by weight, preferably from about 0.05% to about 35% by weight of the total weight of the stabilizer composition.

The stabilizer compositions of this invention are employed in an amount sufficient to impart the desired resistance to heat deterioration to halogen-containing organic polymers. It will be readily apparent to one of ordinary skill in the art, that the precise amount of stabilizer composition used will depend upon several factors, including, but not limited to, the particular halogen-containing organic polymer employed, the temperature to which the polymer will be subjected, and the possible presence of other stabilizing compounds. In general, the more severe the conditions to which the halogen-containing organic polyerm is subjected, and the longer the term required for resisting degradation, the greater will be the amount of stabilizer composition required. Generally, as little as about 0.40 parts by weight of the stabilizer composition per hundred parts by weight of halogen-containing organic polymer will be effective. While there is no critical upper limit to the amount of stabilizer composition which can be employed, amounts in excess of about 10 parts by weight of stabilizer composition per hundred parts by weight of halogen-containing organic polymer do not give an increase in effectiveness commensurate with the additional amount of stabilizer employed.

The articles of manufacture contemplated by this invention are produced from the stabilized polymer compositions according to this invention. These articles of manufacture, e.g. pipe, may be formed from said stabilized polymer compositions by any of the well-known, conventional techniques for forming polymers into shaped articles of manufacture.

The following examples illustrate this invention. Unless otherwise indicated, all parts and percentages in the examples and throughout this specification are by weight.

EXAMPLES 1-4

Several mixtures are prepared by dry blending to 110° C. in a Henschel high intensity mixer (Model 2JSS) 100.0 parts of polyvinyl chloride (Geon 103EP-F-76 available commercially from B. F. Goodrich Chemical Company) with 3.0 parts of fine particle size calcium carbonate coated with calcium stearate, 1.0 part titanium dioxide, 1.2 parts paraffin wax (ADVAWAX® 165 paraffin wax available commercially from Carstab Corporation), 0.60 part calcium stearate, 0.15 part of an oxidized low molecular weight ethylene homopolymer (AC629A available commercially from Allied Chemical Corporation), and each in turn of the stabilizer compositions listed in Table A in the amounts indicated in Table A, said amounts being parts by weight of stabilizer per hundred parts polyvinyl chloride. The resulting mixture is masticated on a two-roll mill at about 193° C. Samples are taken at one minute intervals beginning after the first introduction of the mix to the mill.

The appearance of each sample taken from the mill is evaluated using the following scale: ##STR67##

The results of these tests are indicated in Table A.

                                      TABLE A                                      __________________________________________________________________________                              Parts                                                                              Minutes of Milling                                Example                  By  1  2  3 4 5 6 7 8 9 10                            No.  Stabilizer Composition                                                                             Weight                                                                             COLOR                                             __________________________________________________________________________     1    Mono-organotin Cmpd. NO. 3 from                                                                    0.40                                                                               10 9  8 7+                                                                               6 5 4 2 1 1                                  Table I                                                                         ##STR68##          0.08                                                  2    Mono-organotin Cmpd. No. 7 from                                                                    0.40                                                                               10+                                                                               10+                                                                               9 9 8 8 7 6 4 2                                  Table II                                                                        ##STR69##          0.20                                                  3    Mono-organotin Cmpd. No. 8 from                                                                    0.35                                                                               10+                                                                               10+                                                                               9 8+                                                                               8 7 6 5 3 2                                  Table III                                                                       ##STR70##          0.10                                                  4    Mixture of equal wt. proportions of                                                                0.30                                                                                9+                                                                               9  8 7 7 5 4 3 2 0                                  mono-organotin Cmpd. No. 1 from Table                                          I and diorganotin Cmpd. D from Table                                           VI                                                                              ##STR71##          0.03                                                  __________________________________________________________________________

EXAMPLES 5-7

The stabilizer compositions indicated in Table B below are tested in the same manner and with substantially equivalent results as the stabilizer compositions of Examples 1-4.

                  TABLE B                                                          ______________________________________                                                                        Parts                                           Example                        By                                              No.      Stabilizer Composition                                                                               Weight                                          ______________________________________                                         5        Mono-organotin Cmpd. No. 10 from                                                                     0.50                                                     Table III                                                                       ##STR72##            0.30                                            6a       Mixture of equal wt. proportions of                                                                  0.30                                                     mono-organotin Cmpd. No. 1 from                                                Table I and diorganotin Cmpd. D                                                from Table VI                                                                   ##STR73##            0.10                                            6b       Mixture of equal wt. proportions of                                                                  0.30                                                     mono-organotin Cmpd. No. 1 from                                                Table I and diorganotin Cmpd. D                                                from Table VI                                                                  HSCH.sub.2 CH.sub.2 OH                                                                               0.10                                            6c       Mixture of equal wt. proportions of                                                                  0.30                                                     mono-organotin Cmpd. No. 1 from                                                Table I and diorganotin Cmpd. D                                                from Table VI                                                                  HSCH.sub.2 COOH       0.05                                            7        Mono-organotin Cmpd. No. 5 from                                                                      0.40                                                     Table I                                                                         ##STR74##            0.15                                            ______________________________________                                    

Other features, advantages and specific embodiments of this invention will become readily apparent to those exercising ordinary skill in the art after reading the foregoing disclosures. These specific embodiments are within the scope of the claimed subject matter unless otherwise expressly indicated to the contrary. Moreover, while a few specific embodiments of this invention have been described in considerable detail, variations and modifications of these embodiments can be effected without departing from the spirit and scope of the invention as disclosed and claimed. 

What we claim and desire to protect by Letters Patent is:
 1. A composition capable of stabilizing halogen-containing organic polymers against the deterioration effects of heat, said composition consisting essentially of the product produced by blending:A. a mono-organotin compound or mixture of mono-organotin compounds selected from compounds having the formulas: ##STR75## wherein X and X¹ are the same or different and are selected from --SR², ##STR76## and O--R⁸ with the proviso that in formula (V) when z=1 and in formulas (III) and (IV) at least one X or X¹ is --SR² ;Y is ##STR77## W and W¹ are the same or different and are oxygen or sulfur; R and R¹ are the same or different and are selected from alkyl, aryl, alkenyl, aralkyl, alkaryl, cycloalkyl, cycloalkenyl, ##STR78## R² is alkyl, alkenyl, aryl cycloalkyl, cycloalkenyl, ##STR79## R³ is alkylene of at least 2 carbon atoms, arylene, alkenylene of at least 2 carbon atoms, cycloalkylene, or cycloalkenylene; R⁴ is alkylene, arylene, alkenylene of at least 2 carbon atoms, cycloalkylene, or cycloalkenylene; R⁵ is R³ ; R⁶ is nothing or R⁴ ; R⁷ is --H or R⁸ ; R⁸ is alkyl, alkenyl, aryl, aralkyl, alkaryl, cycloalkyl, or cycloalkenyl; R⁹ is C₁ to C₄ alkylene; R¹² is --H or a monovalent C₁ to C₂₀ hydrocarbon radical; R¹³ and R²¹ are the same or different and are each C₁ to C₂₀ alkyl or C₁ to C₂₀ alkoxy; q=0 or an integer from 1 to 4 inclusive; v=an integer from 1 to 8 inclusive; and w=0, 1 or 2, x=0 or 1, z=0 or 1 with the proviso that when x=0 then z=1, when x=1 then z=0 and w=1, when w=2 then x=0 and z=1, and when w=0 then x=0, z=1 and Y is --W--R³ --W¹ -- or ##STR80## and B. in a synergistically effective amount, a mercaptan-containing organic compound or mixture or mercaptan-containing organic compounds selected from compounds having the formula: ##STR81## where R¹⁰ is cycloalkyl, cycloalkenyl or phenyl; R¹⁴ is --H, aryl, or C₁ to C₁₈ alkyl; R¹⁵ and R²⁴ are the same or different and are ##STR82## --OH, --SH, aryl, C₁ to C₁₈ alkyl, or --H; R¹⁶ is --H or R⁸ ; R¹⁷ is ##STR83## R¹⁸ is arylene, C₁ to C₈ alkylene, or ##STR84## R¹⁹ is --H or when R¹⁰ is phenyl may be a divalent group which may contain halogen, hydroxy, mercapto or alkyl substituents and which combines with the phenyl to form a napthalene ring R²⁰ is --CH₃, --CH₂ CH₃, or ##STR85## R²³ is ##STR86## --SH, aryl, C₁ to C₁₈ alkyl, --OH or --H with the proviso that in formula (VII) when R¹⁰ is phenyl, R²³ is --OH and i=0, then the --OH and --SH groups are on non-adjacent carbon atoms; i=0 or an integer from 1 to 6 inclusive; j=0, 1, 2 or 3; and f=1 or 2; and C. in a synergistically effective amount, a diorganotin compound or mixture of diorganotin compounds selected from compounds having the formulas: ##STR87## wherein R, R¹, W, X, X¹, Y, w and z are as previously defined;n=0, 1 or 2, p=0, 1 or 2 with the proviso that n+p=2, and m=1 to 5; y=1 or 2, y+z=2 with the proviso that when w=0 then Y is --W--R³ --W¹ --, or ##STR88## and in formula (XV) when z=1 and in formulas (XIII) and (XIV) at least one X or X¹ is --SR².
 2. The stabilizer composition of claim 1 wherein the mono-organotin compound or mixture of mono-organotin compounds is according to formula (II).
 3. The stabilizer composition of claim 1 wherein the mono-organotin compound mixture of mono-organotin compounds is according to formula (III).
 4. The stabilizer composition of claim 1 wherein the mono-organotin compound or mixture of mono-organotin compounds is according to formula (IV).
 5. The stabilizer composition of claim 1 wherein the mono-organotin compound or mixture of mono-organotin compounds is according to formula (V).
 6. The stabilizer composition of claim 1 wherein the mercaptan-containing organic compound or mixture of mercaptan-containing organic compounds is according to formula (VI).
 7. The stabilizer composition of claim 1 wherein the mercaptan-containing organic compound or mixture of mercaptan-containing organic compounds is according to formula (VII).
 8. The stabilizer composition of claim 1 wherein the mercaptan-containing organic compound or mixture of mercaptan-containing organic compounds is according to formula (VIII).
 9. The stabilizer composition of claim 1 wherein the mercaptan-containing organic compound or mixture of mercaptan-containing organic compounds is according to formula (IX).
 10. The stabilizer composition of claim 1 wherein the mercaptan-containing organic compound or mixture of mercaptan-containing organic compounds is according to formula (X).
 11. The stabilizer composition of claim 1 wherein the mercaptan-containing organic compound or mixture of mercaptan-containing organic compounds is according to formula (XI).
 12. The stabilizer composition of claim 1 wherein the diorganotin compound or mixture of diorganotin compounds is according to formula (XII).
 13. The stabilizer composition of claim 1 wherein the diorganotin compound or mixture of diorganotin compounds is according to formula (XIII).
 14. The stabilizer composition of claim 1 wherein the diorganotin compound or mixture of diorganotin compounds is according to formula (XIV).
 15. The stabilizer composition of claim 1 where the diorganotin compound or mixture of diorganotin compounds is according to formula (XV).
 16. The stabilizer composition of claim 2 wherein the formula (II) R¹ is methyl or butyl, W is sulfur, and X is --SR² where R² is ##STR89##
 17. The stabilizer composition of claim 3 wherein in formula (III) R is methyl or butyl and X is --SR² where ##STR90##
 18. The stabilizer composition of claim 4 wherein in formula (IV) R is methyl, X is --SR² where R² is ##STR91## R¹ is methyl, X¹ is --SR² where R² is ##STR92## Y is --S-- and q=0.
 19. The stabilizer composition of claim 5 wherein in formula (V) R is methyl, X is --SR² where R² is ##STR93## R¹ is methyl, X¹ is --SR² where R² is ##STR94## Y is --S--, w=2, x=0 and z=1.
 20. The stabilizer composition of claim 6 wherein in formula (VI) R¹⁴ is --H, R²⁴ is --H, R¹⁵ is ##STR95## and i=1.
 21. The stabilizer composition of claim 7 wherein in formula (VII) R¹⁰ is phenyl, R¹⁴ is --H, R²³ is --H, R¹⁹ is --H, i=1 and j=1.
 22. The stabilizer composition of claim 8 wherein in formula (VIII) R¹⁴ is --H, R¹⁷ is ##STR96## and i=1.
 23. The stabilizer composition of claim 9 wherein the formula (IX) R¹⁴ is --H and i=1.
 24. The stabilizer composition of claim 10 wherein in formula (X) R²⁰ is --C₂ H₅ or ##STR97## R¹⁴ is --H and i=1.
 25. The stabilizer composition of claim 11 wherein in formula (XI) R¹⁴ is --H and i=1.
 26. The stabilizer composition of claim 12 wherein in formula (XII) R is methyl or butyl, R¹ is methyl or butyl, and W is sulfur.
 27. The stabilizer composition of claim 13 wherein in formula (XIII) R is methyl or butyl, R¹ is methyl or butyl, X is --SR² where R² is ##STR98## and X¹ is --SR² where R² is ##STR99##
 28. The stabilizer composition of claim 14 wherein in formula (XIV) R is methyl or butyl, R¹ is methyl or butyl, Y is --S--, X is --SR² where R² is ##STR100## X¹ is --SR² where R² is ##STR101## m=1, n=2 and p=0.
 29. The stabilizer composition of claim 15 wherein in formula (XV) R is methyl or butyl, R¹ is methyl or butyl, X is --SR² where R² is ##STR102## Y is --S--, w=2, y=1 and z=1.
 30. The stabilizer composition of claim 1 wherein the mono-organotin compound or mixture of mono-organotin compounds is acccording to formulas II, III, IV or V where X and X¹ are --SR² ; the mercaptan-containing organic compound or mixture of mercaptan-containing organic compounds is according to formula VI where R²⁴ is --H, R¹⁵ is ##STR103## and R¹⁶ is R⁸ ; and the diorganotin compound or mixture of diorganotin compounds is according to formula XIII, XIV or XV where X and X¹ are --SR².
 31. The stabilizer composition of claim 30 wherein R² in formulas II, III, IV, V, XIII, XIV and XV is ##STR104##
 32. The stabilizer composition of claim 31 wherein R² is ##STR105##
 33. The stabilizer composition of claim 30 wherein R¹⁵ in formula VI is ##STR106##
 34. The stabilizer composition of claim 31 wherein R¹⁵ in formula VI is ##STR107##
 35. The stabilizer composition of claim 32 wherein R¹⁵ in formula VI is ##STR108##
 36. The stabilizer composition of claim 30 wherein the mercaptan-containing organic compound is 2-mercaptoethyl oleate.
 37. The stabilizer composition of claim 1 wherein the mercaptan-containing organic compound or mixture of mercaptan-containing organic compounds is a mixture of 2-mercaptoethyl oleate and 2-mercaptoethanol.
 38. The stabilizer composition of claim 1 wherein said stabilizer composition consists essentially of from about 10% by weight to about 60% by weight based on the total weight of the stabilizer composition of mercaptan-containing organic compound or mixture of mercaptan-containing organic compounds, from about 0.5% to about 75% by weight based on the total weight of the stabilizer composition of diorganotin compound or mixture of diorganotin compounds, the balance essentially mono-organotin compound or mixture of mono-organotin compounds.
 39. The stabilizer composition of claim 38 wherein the diorganotin compound or mixture of diorganotin compounds comprises from about 0.05% to about 35% by weight of the total weight of the stabilizer composition.
 40. The stabilizer composition of claim 38 wherein the mercaptan-containing organic compound or mixture of mercaptan-containing organic compounds comprises from about 20% to about 40% by weight of the total weight of the stabilizer composition.
 41. A polymer composition comprising a halogen-containing organic polymer and a stabilizingly effective amount of a stabilizer composition according to claim
 1. 42. A pipe comprising a halogen-containing organic polymer and a stabilizingly effective amount of a stabilizer composition according to claim
 1. 43. The stabilizer composition of claim 1 wherein the mercaptan containing organic compound is a mixture of compounds according to formula (VI) where R¹⁴ is --H, R²⁴ is --H, R¹⁵ is ##STR109## and i=1 and compounds according to formula VI where R¹⁴ is --H, R²⁴ is --H, and R¹⁵ is --OH.
 44. The stabilizer composition of claim 43 wherein the monoorganotin compound or mixture of mono-organotin compounds is according to formula II, III, IV or V where X and X¹ are --SR² where R² is ##STR110## and the diorganotin compound or mixture of diorganotin compounds is according to formulas XIII, XIV or XV and X and X¹ are --SR² where R² is ##STR111##
 45. The stabilizer composition of claim 1 wherein essentially all of component A isa mono-organotin compound or mixture of mono-organotin compounds selected from compounds having the formulas: ##STR112## wherein X and X¹ are the same or different and are selected from --SR², ##STR113## and O--R⁸ with the proviso that in formula (V) when z=1 and in formulas (III) and (IV) at least one X or X¹ is --SR² ;Y is ##STR114## W and W¹ is oxygen; R and R¹ are the same or different and are selected from alkyl, aryl, alkenyl, aralkyl, alkaryl, cycloalkyl, cycloalkenyl, ##STR115## R² is alkyl, alkenyl, aryl cycloalkyl, cycloalkenyl ##STR116## R³ is alkylene of at least 2 carbon atoms, arylene, alkenylene of at least 2 carbon atoms, cycloalkylene, or cycloalkenylene; R⁴ is alkylene, arylene, alkenylene of at least 2 carbon atoms, cycloalkylene, or cycloalkenylene; R⁵ is R³ ; R⁶ is nothing or R⁴ ; R⁷ is --H or R⁸ ; R⁸ is alkyl, alkenyl, aryl, aralkyl, alkaryl, cycloalkyl, or cycloalkenyl; R⁹ is C₁ or C₄ alkylene; R¹² is --H or a monovalent C₁ to C₂₀ hydrocarbon radical; R¹³ and R²¹ are the same or different and are each C₁ to C₂₀ alkyl or C₁ to C₂₀ alkoxy; q=0 or an integer from 1 to 4 inclusive; v=an integer from 1 to 8 inclusive; and w=0, 1 or 2, x=0 or 1, z=0 or 1 with the proviso that when x=0 then z=1, when x=1 then z=0 and w=1, when w=2 then x=0 and z=1, and when w=0 then x=0, z=1 and Y is --W--R³ --W¹ -- or ##STR117## and essentially all of component C is a diorganotin compound or mixture of diorganotin compounds selected from compounds having the formulas: ##STR118## wherein R, R¹, W, X, X¹, y, w and z are as previously defined; n=0, 1 or 2, p=0, 1 or 2 with the proviso that n+p=2, and m=1 to 5; y=1 or 2, y+z=2 with the proviso that when w=0 then Y is --W--R³ --W¹ --, or ##STR119## and in formula (XV) when z=1 and in formulas (XIII) and (XIV) at least one X or X¹ is --SR².
 46. The stabilizer composition of claim 45 wherein component A is a monoorganotin compound or mixture of monoorganotin compounds according to formula (III) where X is SR² and R² is ##STR120## and component C is a diorganotin compound or mixture of dioorganotin compounds according to formula (XIII) where X and X¹ are --SR² where R² is ##STR121##
 47. The stabilizer composition of claim 46 wherein R² in formulas (III) and (XIII) is ##STR122##
 48. The stabilizer composition of claim 46 wherein R² in formulas (III) and (XIII) is ##STR123##
 49. The stabilizer composition of claim 45, 46, 47, or 48 wherein the component B mercaptan-containing organic compound or mixture of mercaptan-containing compounds is according to formula (VI) where R²⁴ is --H, R¹⁵ is ##STR124## and R¹⁶ is R⁸.
 50. The stabilizer composition of claim 49 wherein R¹⁵ is ##STR125##
 51. The stabilizer composition of claim 49 wherein component B is selected from the group consisting of 2-mercaptoethanol. lauryl mercaptide, 2-mercaptoethyl oleate, 2-mercaptoethyl stearate, isooctyl thioglycolate and mixtures thereof.
 52. The stabilizer composition of claim 49 wherein component B is a mixture of 2-mercaptoethanol and 2-mercaptoethyl oleate.
 53. The stabilizer composition of claim 49 wherein component B is 2-mercaptoethyl oleate. 